Tack-driving machine



(No Model.) D. B. NYE.

TACK DRIVING MACHINE.

No.`533,733. Patented Peb. 5, 1895.

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UNITED Snfrss Barnett Orrrom DAVID B. NYE, OF CAMBRIDGE, ASSIGNOR TO THEBOSTON LASTING MACHNE COMPANY, OF BOSTON, MASSACHUSETTS.

TACK-DRIVING MACHINE.

SPECIFICATION forming part of Letters Eatent No. 533,733, dated February5, 1,895 Application tiled July 16,1 894. Serial No. 517,632. (Nomodel.)

.To @ZZ whom it may concern.-

Be it known that l, DAVID B. NYE, of Oambridge, in the county otMiddlesex and State of Massachusetts, have invented certain new anduseful Improvements in Tack-Driving Machines, ot' which the following isa specication.

This invention relates to the delivery nozzles for tack-drivingmachines, and particularly to the type of delivery nozzle shown inLetters Patent ot the United States No. 464,200, dated December l, 1891,said patent showing a tack-delivering nozzle composed of a rigidexternal shield or tube and an internal split or elastic guide-tubecontained in the external tube and made shorter than the latter, thesaid elastic tube being adapted to yieldingly grasp the heads of thetacks driven through the nozzle and cause the tacks to assume a verticalposition when being driven.

The present invention has for its object to increase the durability andefficiency ot the internal guidetube; and to this end it consists in adelivery nozzle composed of an external tube or shield, a sectionalexpansible guide-tube within said shield composed of a series ofindependently movable fingers or sections, and a spring surrounding thesec tional guide-tube and interposed between the latter and the externaltube or shield, said spring being adapted to normally contract thesections ot the guide-tube and insure their operative relation to eachother and to the tack which is being driven, regardless of theconditions of the said sections or lingers as to their inherentresilience or as to their connection with each other at the upper end ofthe guide-tube.

Of the accompanying drawings, forming a part ot this specification,Figure 1 represents a vertical section of a delivery nozzle providedwith my present improvements. Fig. 2 represents a section on line 2-2 ofFig. 1. Fig. 3

represents a perspective view of the guide tube with its inclcsingspring detached from the external tube or shield, the said figures beingmade on an enlarged scale.

In the drawings--d represents the external tube or shield which is, ormay be, of substantially the form represented in the Patent No. 464,200above mentioned, and is screwed into a collar or holder substantially asshown in said patent. I

The internal guide-tube is composed of a series of sections or fingers cc, which are preferably made of sheet metal and are here shown as formedintegral with a flanged tubular neck c', the flange o2 of which rests ona seat at the upper end of the external tube or shield a, thisconstruction bein g substantially as set torth in Letters Patent No.513,820,"

dated January 80, 1894. I do not limit mysell", however, to the mannerof connecting the sections with each other and to the tube or shield ahere shown, as said sections may be constructed and arranged in anysuitable manner which will permit them to move iudependently and to beclosed or pressed inwardly by the inclosing spring hereinafterdescribed.

d represents a spring, which is preferably a rubber tube formed tosurround the lingers or sections o and to be interposed between theouter surfaces of said sections and the inner surface of the tube orshield c. Said spring is preferably formed as shown in Figs. 1 and 2,sothat its outer surface bears on the inner surface ot the tube or shielda, the spring acting, therefore, as an annular cushion which iscompressed by the outward movement ofthe sections c caused by thepassage of a tack through the guide-tube, and in its edort to expandexerts inward pressure on said sections, which presses them closelyagainst the head of a tack passing through the guide-tube, causing thecentering action described in Patent No. 464,200 above mentioned.

It will be seen that the annular spring inclosing the sectionalguide-tube insures the contraction of said tube around the tack-headwithout regard to the condition of said sections as to their connectionwith each other and with the external tube or shield a; so that it saidsections when connected by the tubular neck c in the manner shown shouldbecome set, and thus lose their elasticity; or it said neck should becracked or broken, so that the sections are left independent of eachother, the action of the guide tube will not IOO tilting a resilienthacking or support for the ngers and holding them yieldingly against atack-head in the tube.

In testimony whereof I have signed my name to this specification, in thepresence or' two subscribing witnesses, this 13th day of July, A. D.1894.

DAVID n. NYE.

Witnesses:

C. F. BROWN, A. D. HARRISON.

